Edge 5W-50 in an engine specced for 20W-50

Messages
508
Location
Brittany, France
Of course a hot 15W-50 drains faster than cold 5W-40, did you read any of the responses in this thread? That isn't what you were asking about.

Here is a graph of the viscosity of a typical 15W-40 plotted against a typical 5W-40 (in Celsius). What do you see?

Again, no oil regardless of the winter rating is ever too thin in cold temperatures. If it isn't too thin when hot it won't be too thin when cold. In fact it will be massively thick.

View attachment 46748
Isn't the spread between 5w40 and 15w40 wider at freezing?
curva-viscosidad-aceite-motor.jpg
 
Messages
235
Location
Australia
5w50 is a fairly new grade its fine in anything that can use a 50 grade. Its only 'thinner' on start up or when cold. It would need to be -50w50 to be anywhere near as thin as it is when hot.
 
Messages
4,632
Location
Decatur AL USA
My only concern with 5W-50 is how shear prone I've seen some look (Down in the 30 Grade Range by OCI Time). I think I would be more prone to run a 5W-40 HDEO which tends to go in thinner but come out thicker.
 
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